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[media] mn88472: implement cnr statistics

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Implement DVBv5 CNR.

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Antti Palosaari 2017-03-17 13:34:44 -03:00 committed by Mauro Carvalho Chehab
parent 61d7c6aa4f
commit c635a5e2cf
2 changed files with 88 additions and 3 deletions
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90
drivers/media/dvb-frontends/mn88472.c
View File

@ -28,9 +28,9 @@ static int mn88472_read_status(struct dvb_frontend *fe, enum fe_status *status)
struct i2c_client *client = fe->demodulator_priv;
struct mn88472_dev *dev = i2c_get_clientdata(client);
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
int ret, i;
unsigned int utmp, utmp1;
u8 buf[2];
int ret, i, stmp;
unsigned int utmp, utmp1, utmp2;
u8 buf[5];
if (!dev->active) {
ret = -EAGAIN;
@ -96,6 +96,89 @@ static int mn88472_read_status(struct dvb_frontend *fe, enum fe_status *status)
c->strength.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
}
/* CNR */
if (*status & FE_HAS_VITERBI && c->delivery_system == SYS_DVBT) {
/* DVB-T CNR */
ret = regmap_bulk_read(dev->regmap[0], 0x9c, buf, 2);
if (ret)
goto err;
utmp = buf[0] << 8 | buf[1] << 0;
if (utmp) {
/* CNR[dB]: 10 * log10(65536 / value) + 2 */
/* log10(65536) = 80807124, 0.2 = 3355443 */
stmp = ((u64)80807124 - intlog10(utmp) + 3355443)
* 10000 >> 24;
dev_dbg(&client->dev, "cnr=%d value=%u\n", stmp, utmp);
} else {
stmp = 0;
}
c->cnr.stat[0].svalue = stmp;
c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
} else if (*status & FE_HAS_VITERBI &&
c->delivery_system == SYS_DVBT2) {
/* DVB-T2 CNR */
for (i = 0; i < 3; i++) {
ret = regmap_bulk_read(dev->regmap[2], 0xbc + i,
&buf[i], 1);
if (ret)
goto err;
}
utmp = buf[1] << 8 | buf[2] << 0;
utmp1 = (buf[0] >> 2) & 0x01; /* 0=SISO, 1=MISO */
if (utmp) {
if (utmp1) {
/* CNR[dB]: 10 * log10(16384 / value) - 6 */
/* log10(16384) = 70706234, 0.6 = 10066330 */
stmp = ((u64)70706234 - intlog10(utmp)
- 10066330) * 10000 >> 24;
dev_dbg(&client->dev, "cnr=%d value=%u MISO\n",
stmp, utmp);
} else {
/* CNR[dB]: 10 * log10(65536 / value) + 2 */
/* log10(65536) = 80807124, 0.2 = 3355443 */
stmp = ((u64)80807124 - intlog10(utmp)
+ 3355443) * 10000 >> 24;
dev_dbg(&client->dev, "cnr=%d value=%u SISO\n",
stmp, utmp);
}
} else {
stmp = 0;
}
c->cnr.stat[0].svalue = stmp;
c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
} else if (*status & FE_HAS_VITERBI &&
c->delivery_system == SYS_DVBC_ANNEX_A) {
/* DVB-C CNR */
ret = regmap_bulk_read(dev->regmap[1], 0xa1, buf, 4);
if (ret)
goto err;
utmp1 = buf[0] << 8 | buf[1] << 0; /* signal */
utmp2 = buf[2] << 8 | buf[3] << 0; /* noise */
if (utmp1 && utmp2) {
/* CNR[dB]: 10 * log10(8 * (signal / noise)) */
/* log10(8) = 15151336 */
stmp = ((u64)15151336 + intlog10(utmp1)
- intlog10(utmp2)) * 10000 >> 24;
dev_dbg(&client->dev, "cnr=%d signal=%u noise=%u\n",
stmp, utmp1, utmp2);
} else {
stmp = 0;
}
c->cnr.stat[0].svalue = stmp;
c->cnr.stat[0].scale = FE_SCALE_DECIBEL;
} else {
c->cnr.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
}
return 0;
err:
dev_dbg(&client->dev, "failed=%d\n", ret);
@ -570,6 +653,7 @@ static int mn88472_probe(struct i2c_client *client,
/* Init stats to indicate which stats are supported */
c = &dev->fe.dtv_property_cache;
c->strength.len = 1;
c->cnr.len = 1;
/* Setup callbacks */
pdata->get_dvb_frontend = mn88472_get_dvb_frontend;

1
drivers/media/dvb-frontends/mn88472_priv.h
View File

@ -18,6 +18,7 @@
#define MN88472_PRIV_H
#include "dvb_frontend.h"
#include "dvb_math.h"
#include "mn88472.h"
#include <linux/firmware.h>
#include <linux/regmap.h>